Well we don't know where you are so it's not that easy a question. In the United States I think the resorts generally open some time after the ski season ends. On the east coast I think most parks open around early may (diablo opening day was may 3rd this year). No clue about the west coast and europe though.
Again, depends on snow. But this year Keystone was open until mid September and Winter Park the 3rd weekend in Sept.
The good news is Sol Vista was open until the last weekend in September and they could have been open longer. Hopefully they'll get enough business next year to encourage them to stay open a few more weeks.
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